Presentation on theme: "Types of saw blades Crosscut –used to make smooth cuts across the grain Rip –used to make smooth fast cuts with the grain Combination –used to make fast."— Presentation transcript:
Types of saw blades Crosscut –used to make smooth cuts across the grain Rip –used to make smooth fast cuts with the grain Combination –used to make fast cuts with or across the grain Carbide tipped –more expensive but have a longer life
Other saw blades Hacksaw –is selected by length, gauge, set of teeth, teeth per inch, and metal hardness. Band saw –similar to hacksaw blade, except it is a continuous blade Both of these types should be selected to to allow three teeth to be in contact with the surface being cut.
Sabre saw blades Three types 1.knife –for cutting leather 2.metal cutting –have 16 to 32 teeth per inch 3.wood cutting –have 6 to 12 teeth per inch
Uses of the portable circular saw replaces the handsaw in most cases takes the place of the bench or table saw use in same or different location on any particular job used for ripping, crosscutting, dodoing, grooving,angle cuts,bevels and mitres. Considered one of the most important labor saving pieces of equipment in the shop WHY?
Procedure for using the circular saw select a sharp blade of the correct type properly adjust the saw and be sure all thumbscrews are tight blade should be installed so that the teeth turn up toward the saw base teeth should extend below the thickness of the material to be cut to a distance equal to the depth of the teeth secure material to be cut
start saw before blade touches the work saw only in a forward direction must be guided along a straight line both hands should be used if possible at the end of the cut release the trigger switch and allow the blade to follow through as the saw is lifted away from work
Parts of the Sabre saw on-off switch guide knob blade screw toe blade tilting base tilt adjustment handle power cord strain reliever
Uses of the sabre saw referred to as electric jigsaws or bayonet saws make a reciprocating motion or orbital or oval motion allows the cut to be made on the upward stroke and the release of the chips on the downward stroke stroke of blade is about 1 inch saw cut varies from about 3200 to 4200 strokes per minute
motor sizes vary from about 1/6 to 1/2 HP considered to be very versatile can cut wood, sheet metal, plastics, fiberglass, rods, tubing, rubber, masonite, leather, and other materials to use this for different types of materials, the blade has to be the right type